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powerpc/traps: Print VMA for unhandled signals 

This adds VMA address in the message printed for unhandled signals,
similarly to what other architectures, like x86, print.

Before this patch, a page fault looked like:

  pandafault[61470]: unhandled signal 11 at 100007d0 nip 1000061c lr 7fff8d185100 code 2

After this patch, a page fault looks like:

  pandafault[6303]: segfault 11 at 100007d0 nip 1000061c lr 7fff93c55100 code 2 in pandafault[10000000+10000]

Signed-off-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Murilo Opsfelder Araujo 2018-08-01 18:33:18 -03:00 committed by Michael Ellerman
parent 49d8f2011d
commit 0f642d616b
1 changed files with 19 additions and 2 deletions
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21
arch/powerpc/kernel/traps.c
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@ -96,6 +96,19 @@ EXPORT_SYMBOL(__debugger_fault_handler);
#define TM_DEBUG(x...) do { } while(0)
#endif
static const char *signame(int signr)
{
switch (signr) {
case SIGBUS: return "bus error";
case SIGFPE: return "floating point exception";
case SIGILL: return "illegal instruction";
case SIGSEGV: return "segfault";
case SIGTRAP: return "unhandled trap";
}
return "unknown signal";
}
/*
* Trap & Exception support
*/
@ -317,9 +330,13 @@ static void show_signal_msg(int signr, struct pt_regs *regs, int code,
if (!unhandled_signal(current, signr))
return;
pr_info("%s[%d]: unhandled signal %d at %lx nip %lx lr %lx code %x\n",
current->comm, current->pid, signr,
pr_info("%s[%d]: %s (%d) at %lx nip %lx lr %lx code %x",
current->comm, current->pid, signame(signr), signr,
addr, regs->nip, regs->link, code);
print_vma_addr(KERN_CONT " in ", regs->nip);
pr_cont("\n");
}
void _exception_pkey(int signr, struct pt_regs *regs, int code,